From 616746c2e01a0425a9fc62d24153d88079f0daac Mon Sep 17 00:00:00 2001
From: henryk <henryk@6dc7ffe9-61d6-0310-9af1-9938baff3ed1>
Date: Wed, 21 Nov 2007 04:45:15 +0000
Subject: Commit status quo: Start adding iso 14443 layer 3a code Currently
 working on fiq for pio data change to reset tc0 via swtrg

git-svn-id: https://svn.openpcd.org:2342/trunk@336 6dc7ffe9-61d6-0310-9af1-9938baff3ed1
---
 openpicc/application/iso14443_layer3a.c | 143 ++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 openpicc/application/iso14443_layer3a.c

(limited to 'openpicc/application/iso14443_layer3a.c')

diff --git a/openpicc/application/iso14443_layer3a.c b/openpicc/application/iso14443_layer3a.c
new file mode 100644
index 0000000..26a6115
--- /dev/null
+++ b/openpicc/application/iso14443_layer3a.c
@@ -0,0 +1,143 @@
+/***************************************************************
+ *
+ * OpenPICC - ISO 14443 Layer 3 Type A state machine
+ *
+ * Copyright 2007 Henryk Plötz <henryk@ploetzli.ch>
+ *
+ ***************************************************************
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; version 2.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+*/
+
+#include <FreeRTOS.h>
+#include <board.h>
+#include <task.h>
+
+#include "openpicc.h"
+#include "iso14443_layer3a.h"
+#include "ssc_picc.h"
+#include "pll.h"
+#include "tc_fdt.h"
+#include "tc_cdiv.h"
+#include "tc_cdiv_sync.h"
+#include "usb_print.h"
+#include "cmd.h"
+
+static enum ISO14443_STATES state = STARTING_UP;
+#define PLL_LOCK_HYSTERESIS portTICK_RATE_MS*5
+
+#define LAYER3_DEBUG usb_print_string
+
+void iso14443_layer3a_state_machine (void *pvParameters)
+{
+	unsigned long int last_pll_lock = ~0;
+	(void)pvParameters;
+	while(1) {
+		ssc_dma_buffer_t* buffer = NULL;
+		portBASE_TYPE need_receive = 0, switch_on = 0;
+		
+		/* First let's see whether there is a reader */
+		switch(state) {
+			case STARTING_UP: /* Fall through */
+			case ERROR:
+				// do nothing here
+				break;
+			case POWERED_OFF:
+				if(pll_is_locked()) {
+					unsigned long int now = xTaskGetTickCount();
+					if(now - last_pll_lock > PLL_LOCK_HYSTERESIS) { 
+						/* Go to idle when in POWERED_OFF and pll 
+						 * was locked for at least 
+						 * PLL_LOCK_HYSTERESIS ticks */
+						switch_on = 1;
+						last_pll_lock = ~0;
+						LAYER3_DEBUG("PLL locked, switching on \n\r");
+					} else last_pll_lock = now; 
+				} else last_pll_lock = ~0;
+				break;
+			default:
+				if(!pll_is_locked()) {
+					unsigned long int now = xTaskGetTickCount();
+					if(now - last_pll_lock > PLL_LOCK_HYSTERESIS) {
+						/* Power off when not powered off and pll
+						 * was unlocked for at least  PLL_LOCK_HYSTERESIS
+						 * ticks */
+						state = POWERED_OFF;
+						ssc_rx_stop();
+						last_pll_lock = ~0;
+						LAYER3_DEBUG("PLL lost lock, switching off \n\r");
+						continue; 
+					} else last_pll_lock = now; 
+				} else last_pll_lock = ~0;
+				break;
+		}
+		
+		switch(state) {
+			case STARTING_UP:
+				pll_init();
+			    
+				tc_cdiv_init();
+				tc_cdiv_set_divider(32);
+				tc_fdt_init();
+#if 0
+				ssc_tx_init();
+#else
+				AT91F_PIO_CfgInput(AT91C_BASE_PIOA, OPENPICC_MOD_PWM);
+				AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, OPENPICC_MOD_SSC | 
+						    OPENPICC_SSC_DATA | OPENPICC_SSC_DATA |
+						    AT91C_PIO_PA15, 0);
+#endif
+				ssc_rx_init();
+				
+				state = POWERED_OFF;
+				break;
+			case POWERED_OFF:
+				if(switch_on == 1) {
+					state=IDLE;
+					continue;
+				}
+				break;
+			case IDLE:
+			case HALT:
+				/* Wait for REQA or WUPA (HALT: only WUPA) */
+				ssc_rx_mode_set(SSC_MODE_14443A_SHORT);
+				ssc_rx_start();
+				need_receive = 1;
+			default:
+				break;
+		}
+		
+		if(need_receive) {
+			if(xQueueReceive(ssc_rx_queue, &buffer, portTICK_RATE_MS)) {
+				portENTER_CRITICAL();
+				buffer->state = PROCESSING;
+				portEXIT_CRITICAL();
+				
+				switch(state) {
+					case IDLE:
+					case HALT:
+						
+						break;
+					default:
+						break;
+				}
+				
+				portENTER_CRITICAL();
+				buffer->state = FREE;
+				portEXIT_CRITICAL();
+			}
+		} else vTaskDelay(portTICK_RATE_MS);
+	}
+}
-- 
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